Nut lock



April 16, 1929. n lc. POELMAN 1,709,539l

NNNNN CK Patented Apr. 16, 1929.

UNITED STATES NUT Application led July 21,

This invention is a nut lock for any conventional form of bolt and nut,and the object l is to provide in combination a specially prepared boltadapted to coact with a specially prepared nut, to the end that thelatter may be releasably locked in place upon the threaded end of thebolt.

In the drawing Figure 1 is a an elevation of the assembly;

Figure 2 is a longitudinal section through vthe assembly, the key, thesprings and a por tion of one end of the bolt being shown in full;

Figure 3 is a detail of the key;

Figure 4 is a detail of the nut.

In carrying out the invention, I provide a bolt 1 of any conventionalform, and slot the ythreaded stem thereof to form a longitudinal key-way2. This key-way is continuous, eX- cept at the inner end thereof is lefta bridge 3, convened at its inner `side as shown at 4, so as to providea narrow, arcuate key anchoring aperture communicating with the mainkey-way 2. The outer threaded end of the bolt 1 is provided with twospring sockets 6 in the plane of the key-way 2 and opening thereinto. Akey 7 is provided, the same being long and fiat and adapted to itloosely in the key-Way 2. This key has a lip 8 adapted to overhangvtheend face 9 of the bolt, and spring seating recesses 10 adapted toregister with the sockets 6 when the key is in place in the key-way 2.The tail 11 of this key is curved to conform with the aperture 5 of thebolt. Coil springs 12 are provided for the sockets 6. The nut 13isformed with two diametrically opposed slots 14 in the inner peripheralwall of the threaded bore thereof, the said slots being ofV a widthcorresponding with the key-way 2.

The elements are assembled by inserting the curved tail 11 of the keyT 7within the aperture 5 and laying the stein of the key within theVkey-way 2. The springs 12 are seated in the sockets 6 and the recesses10 of the key are seated over the outer ends of these springs. The key 7is then pressed inwardly against the action of the springs, andthe nut13 is turnedonto the end of the bolt. It will be PATENT. OFFICE.

l CORNELIUS POELMAN,

or CHICAGO, ILLINOIS.

Loox.

1928. Serial No. 294,883.

, noted that as the slots 14 successively align with the key 7, thelatter will be forced outwardly into that slot, thereby preventing theunturning of the nut, except as the key 7 may be intentionally depressedwithin the key-way 2 f-or that purpose. Thecurved tail 11 of the key 7serves to retain the key in place within the key-way 2, and the lip 8 ofthe key serves to hold the key against sliding longitudinally inwardlyalong the key-way 2.

. Therefore, the purpose of the lip 8 is both to prevent the inwardlongitudinal movement of the key 7 and to keep the springs 12 properlyaligned with their seating recesses 1U. This lip 8 also serves to engagea tool whenever it may be desired to draw out the said key 7 for anypurpose.

While I have herein described a certain specific manner andmethod ofconstructing and assembling the elements of my invention,

'it is understood that I may vary from the saine in minor details, notdeparting from the I bination of a bolt having a key-way extended outlongitudinally through the threaded end7 the inner end of the key-waybeing bridged to form an arcuate key retaining aperture, the said bolthaving also spring sockets in its outer threaded end in the plane of thekeyway and opening thereinto, a nut having slots upon the innerperipheral wall of its threaded bore adapted to register with the saidkey way of the bolt upon the turning ofthe nut, a key looselyy fittedwithin the said key-way of the bolt, the same having a curved tail forengaging the key retaining aperture of the key-Way of the bolt, havingrecesses adapted to align with the said spring sockets of the bolt, andhaving av lip adapted to lit over the end face of the bolt, and springsseated within sov

